[Core] Fix return type in t.get_file_progress

deluge/core/torrent.py

@@ -583,7 +583,7 @@ class Torrent(object):
     def get_file_progress(self):
         """Returns the file progress as a list of floats.. 0.0 -> 1.0"""
         if not self.handle.has_metadata():
-            return 0.0
+            return []
 
         file_progress = self.handle.file_progress()
         ret = []